<template>
  <!-- 头部部分 -->
    <header class="header">
      <h1>todos</h1>
      <input v-model="todoName" @keyup.enter="add" class="new-todo" placeholder="请输入任务名称" autofocus />
    </header>
</template>

<script>
export default {
  data(){
    return {
      todoName: '',
    }
  },
  methods:{
    add(){
      if(this.todoName==='')return alert('输入内容不能为空')
      // console.log('123')
      this.$emit('add',this.todoName)
      this.todoName=''
    }
  },
}
</script>

<style scoped>

</style>